The millimeter wave spectrum of rare iron monoxide isotopologues: a mass independent analysis

Waßmuth, Björn

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https://hdl.handle.net/2142/107471 Copy

Description

Title

The millimeter wave spectrum of rare iron monoxide isotopologues: a mass independent analysis

Author(s)

Waßmuth, Björn

Contributor(s)

• Giesen, Thomas
• Fuchs, Guido W.
• Breier, Alexander A.

Issue Date

2020-06-23

Keyword(s)

Small molecules

Abstract

The role of iron containing molecular species in the interstellar medium is not fully understood. Iron monoxide was tentatively detected toward Sagittarius B2.\footnote{C.M. Walmsley \textit{et al.}, \textit{Astrophys. J.}, \textbf{566}:L109-L112, (2002).} In the laboratory the isotopologues $\mathrm{^{56}FeO}$ and $\mathrm{^{54}FeO}$ were rotationally measured in all five spin states in their $X^5\Delta_i$ ground state by Allen et al.\footnote{M.D. Allen \textit{et al.}, \textit{Chem. Phys. Lett.}, \textbf{257}, 130-136, (1996).} We present laboratory measurements of rotational lines of the rare isotopologues $\mathrm{^{57}FeO}$, $\mathrm{^{58}FeO}$, and $\mathrm{^{56}Fe^{18}O}$, including the hyperfine structure splitting due to the nuclear spin $I=1/2$ of $\mathrm{^{57}Fe}$. We performed a mass independent analysis\footnote{A.A. Breier \textit{et al.}, \textit{J. Mol. Spectrosc.}, \textbf{355}, 46-58, (2019).} with the new isotopic data and data from the literature. This enables us to predict molecular parameters and line transitions of the radioactive isotopologue $\mathrm{^{60}FeO}$. Kami\'{n}ski \textit{et al.} detected the radioactive molecule $\mathrm{^{26}AlF}$ in the merger CK Vulpeculae by means of rotational spectroscopy \footnote{T. Kami\'{n}ski \textit{et al.}, \textit{Nature Astronomy}, \textbf{2}, 778-783, (2018).}. This is a powerful novel approach to use molecular transition to search for iron and its isotopes. Iron monoxide is a well suited candidate for a astronomical search for $^{60}\mathrm{Fe}$.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

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http://hdl.handle.net/2142/107471

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Copyright 2020 is held by the Author(s)

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